Furuno SC-110 manual What is WAAS?, AP-12, Egnos Waas Msas Gagan

APPENDIX

6. What is WAAS?

WAAS, available in North and South America mainly, is a provider in the worldwide SBAS (Satellite Based Augmentation System) navigation system. SBAS provides GPS signal corrections to SBAS users, for even better position accuracy, typically better than three meters. There are three more SBAS providers, MSAS (Multi-Functional Satellite Augmentation System), EGNOS (Euro Geostationary Navigation Overlay Service) and GAGAN (GPS Aided Geo Augmented Navigation). All providers are compatible with one another, thus providing seamless position fixes to SBAS users. The illustration below shows the coverage area of the SBAS. (Accuracy may be affected when using a GEO satellite not within your current location.) This manual uses WAAS for these three providers generically.

EGNOS

WAAS

MSAS

GAGAN

Provider	Satellite type	Longitude	Satellite No.
WAAS	Intelsat Galaxy XV	133￿W	135
	TeleSat Anik F1R	107.3￿W	138
EGNOS	Inmarsat-3-F2/AOR-E	15.5￿W	120
	Artemis	21.5￿E	124
	Inmarsat-3-F5/IOR-W	25￿E	126
MSAS	MTSAT-1R	140￿E	129
	MTSAT-2	145￿E	137
GAGAN	Inmarsat-4-F1/IOR	64￿E	127

AP-12